import React,{Component} from 'react'
//引入store,用于获取redux中保存的状态
import store from '../../redux/store'
// 引入actionCreator,专门用于创建action对象
import {createIncrementAction,createDecrementAction,createIncrementAsyncAction} from '../../redux/count_action'

export default class Count extends Component{

  //加
  increment = ()=>{
    const {value} = this.selectNumber
    // 告诉store，需要传递的参数
    store.dispatch(createIncrementAction(value*1))
  }
  //减
  decrement = ()=>{
    const {value} = this.selectNumber
    store.dispatch(createDecrementAction(value*1))
  }
  //奇数再加
  incrementIfOdd = ()=>{
    const {value} = this.selectNumber
    const count = store.getState()      //这里获取的是数值（store里定义的），不需要解构赋值使用{}
    if(count%2 !== 0){
    store.dispatch(createIncrementAction(value*1))
    }
  }
  //异步加
  incrementAsync = ()=>{
    const {value} = this.selectNumber
    // setTimeout(()=>{
    store.dispatch(createIncrementAsyncAction(value*1,500))
    // },500)
  }

  render(){
    return (
      <div>
        <h1>当前求和为：{store.getState()}</h1>
        <select ref={c => this.selectNumber = c}>
          <option value="1">1</option>
          <option value="2">2</option>
          <option value="3">3</option>
        </select><br />
        <button onClick={this.increment}>+</button>&nbsp;
        <button onClick={this.decrement}>-</button>&nbsp;
        <button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
        <button onClick={this.incrementAsync}>异步加</button>
      </div>
    )
  }
}